Fereydoun Lakestani

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With analog scanning, time-domain low-coherence interferometry lacks precise depth information, and optical carrier generation demands a linear scanning speed. Full-field heterodyne low-coherence interferometry that uses a logarithmic complementary metal-oxide semiconductor camera, acousto-optic modulation, and digital depth stepping is reported, with which(More)
Michael J. Connelly, MEMBER SPIE University of Limerick Optical Communications Research Group Limerick, Ireland Abstract. Full-field optical coherence tomography OCT using a complementary metal-oxide semiconductor CMOS camera with an integrated a digital signal processor DSP is demonstrated. The CMOSDSP camera employed is typically used in machine vision(More)
If little is known about the sample under test, ascertaining a quantitative material true stress–true strain relationship from a small punch test is not direct. Conventional inverse simulation methods have used experimental force–displacement curves that ignore the deformation shape of the punched sample. We present small punch test methodology and results(More)
This paper describes the characterization, modeling, and application of a direct-readout complementary metal–oxide–semiconductor (CMOS) camera in white-light interferometry (WLI). The camera that was used consisted of a direct-readout 1024 × 1024 pixel logarithmic CMOS sensor. A continuous analog voltage from each pixel was converted to an 8-bit value by an(More)
The present experiments have been performed in anesthetized dogs. They have allowed to determine the nocivity of air microembolus introduced directly in the circumflex branch of the left coronary artery. It has been suggested that to reduce post-operative disease due to microembolus at the end of an extracorporal circulation it is necessary to forbid the(More)
Despite all precautions taken by cardiac surgeons to eliminate air remaining in the cardiac cavities and pulmonary veins at the end of cardiopulmonary bypass, many micro bubbles probably remain and pass into the systemic circulation with a risk of deteriorations of cerebral or myocardial function. Over the last four years we have used ultrasound to try to(More)
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